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Wifi-Heatmap
Using an Android phone's wifi receiver and GPS, this creates a heatmap overlay on a Google Map
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
i don't know of heatmap creation apps, but i really like the open source Wifi Analyzer, which also measures wifi strength and other parameters in real time
There is a closed source app for that. For open source apps you can check this search. They are mostly python, I found one Android app but it doesn’t provide any description though
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